Junglers, you need to be there for your winning lanes
This is a midgame concept that I think every Jungler should probably learn about. Assuming the Early Game didn't go that bad, you're gonna have at least one winning lane and it's usually gonna turn into the first turret for your team. So...what happens after the enemy tower falls?
You should understand that a winning lane that continues to play like like they're in the laning phase is a complete waste of a winning lane. At best, the hyper carries have an excuse of wanting to safely farm. At worst, you're gonna be fighting against the grain for the rest of the Mid Game to translate whatever leads you have into more objectives since your winning lane is still stuck next to the tower they already destroyed.
Now here is what you shouldn't do: As you are running Top Lane, you are spam pinging your Bot Lane while they are under tower demanding them to rotate top. In the first place, nobody will want to listen to you. Second of all, they won't exactly have the opportunity to roam without your help.
Pop quiz, when is the best time for a laner to roam? There are 3 answers. The best time to roam is after making a gigantic slow pushed wave and crashing it under an enemy's tower. The second best time to roam is generating a gigantic wave and the enemy is somehow, and probably inefficiently, freezing the wave and for whatever reason you can't break it. The third best time to roam is when the enemy is trying to slow push back, but you know it will take a while before that wave becomes a threat to your tower. Conveniently, the distance between the enemy's inner and your outer turrets being farther means much bigger waves and so much more time to roam.
Now let's turn this into a new problem. The enemy outer turret is already down, so that means your laner needs to push way further in to achieve a good crash. In other words, they are far more vulnerable to ganks or simply getting ran down depending on the matchup. With this level of risk in mind, what self respecting laner would want to push out and roam? Yes they won the lane, but playing dumb will only throw that lead and worse. Unless they are really good and really confident with their lead, your winning laner could just end up doing nothing for the rest of the match.
But what if you can get rid of that element of risk, or at least protect your laner from it? The enemy's tower is down, so you have so much more mobility options around that area. The enemy laner is also weaker than your winning laner and lacks protection from outer tower, so as long as you stay within arm's reach of your winning laner, the two of you are probably gonna win any ensuing 2v2s. And hell, the enemy's Jungle is so much more closer to your laners if you help them push up that far or even just stand off to the side of them. Even if your winning laners turn out to be monkeys, you can still turn this into a personal lead as you get to counter jungle the enemy Jungler while being protected by your much stronger laners.
When a turret falls, don't let off the pressure on that lane just yet. Help them push up to the enemy inhib, protect them from hyper extended ganks, and take control of the enemy Jungle. If the enemy Jungler is nowhere to be seen, this is a free ticket to steal his Jungle, his Buffs, or the nearby Dragon/Herald. If something looks fishy, your vision and presence will protect your laners as you all back off and rotate to the other side of the map, winning more objectives as the enemy very slowly pushes out in response to the monster wave your laners threw at them. Be there for you winning lanes; that's how you snowball a single tower into midgame control of the rest of the map.